Alright, if that’s the criteria (even though it can be perceived as a lack thereof), then there’s really nothing you’re going by or can go by based on your sources because they’re all even in that regard.
I’ll give an example in one of them. One of your sources claims that North Korea allows people in like any other nation as long as it’s not one of their three opponents… yet the sources also allude to the fact it’s barricaded, with a river to the North and a guarded wall to the South.